Grok 4.5
xAI · released Jul 8, 2026
- Type
- Proprietary
- Input
- $2.00
- Output
- $6.00
- Cached
- Not published
List price · per 1M tokens · xAI at 500K context · source ↗
Our take
Written Aug 2, 2026xAI's top-tier chat model placed second on Arena Text, the independent human-preference board, in July 2026. Its output price is lower than typical for the tier, but its request limit is half the size of the one-million-token peers.
Pick this for chat-quality-sensitive products on a budget. Use it if your context needs fit within 500,000 tokens. Skip it if you need a one-million-token context or multi-cloud hosting.
The case for it
- A first-tier Arena Text placing (July 2026) at a mid-tier output price.
- Low base price for the tier.
The case against it
- 500,000-token request limit, half the size of the one-million-token peers.
- Only xAI first-party and OpenRouter in our data, so fewer hosting routes than Claude, Gemini or the GPT line.
How good is it?
IntelligencePuzzles, maths, exam questions
Arena Text (overall)20th of 143 · 1468.8
CodingWriting and fixing code on its own
Arena Coding15th of 143 · 1519.7
AgenticPlanning, calling tools, staying on task
Arena Agent (IPS)9th of 36 · 0.055
WritingWe do not rate this
Two boards come close and neither tests writing: Arena Creative Writing asks people which of two replies they prefer, and LiveBench Language tests whether a model understood a passage. So we show where Grok 4.5 placed and give it no mark out of five.
These tests check whether a model follows instructions — a precondition for all the work above, but not a measure of how well that work is done, which is why they get no rating.
Every published score for this model16 scoresEvery figure we hold, from 16 boards, with who ran it and a link to the source — including the boards no rating above is built on.
Or rent it from someone else
Why this differs from the header. The strip above quotes xAI's own list price. This is the cheapest live offer at the widest standard context we hold, whoever is serving it — a reseller undercutting a lab is ordinary commerce, not an error.
- per 1M tokens
- $2.00 in / $6.00 out
- Context served
- 500K
- Throughput
- Not measured
| Provider | In / out per 1M tokens | Context | Throughput | Trains on prompts | Logs prompts | Zero retention |
|---|---|---|---|---|---|---|
| OpenRouter | $2.00 / $6.00 | 500K | not measured | Unknown | Unknown | Unknown |
| xAI | $2.00 / $6.00 | 500K500K out | not measured | Unknown | Unknown | Unknown |
| xAI | $2.00 / $6.00 | 500K | 66 tok/s | No | Yes30 days | Confirmed |
| xAIpriority tier | $4.00 / $12.00 | 500K | 74 tok/s | No | Yes30 days | Unknown |
xAIAcross the 4 listings we hold: 2 say they do not train on prompts, 0 say they do and 2 do not say. 1 appear in the zero-retention registry we check; the rest are unknown to us rather than confirmed either way.
What each host's API supports
From the parameter list each endpoint publishes. Streaming is omitted: nothing we hold reports it, for any model.
- ✓
- Supported
- ✗
- Not supported
- Not published
- host gave no parameter list
| Provider | Tool calling | JSON output | Strict schema |
|---|---|---|---|
| OpenRouter | ✓ | ✓ | ✓ |
| xAI | |||
| xAI | ✓ | ✓ | ✓ |
| xAIpriority | ✓ | ✓ | ✓ |
Tool calling: 3 of 4 listings say yes, 1 publishes no parameter list. JSON output: 3 of 4 listings say yes, 1 publishes no parameter list. Strict schema: 3 of 4 listings say yes, 1 publishes no parameter list.
Models people weigh against Grok 4.5
When we formed this view
Dates behind this page
Prices last checked 9d ago
What we do not know about this model yet
- 1 of 4 listings publish no parameter list, so what their API accepts is unknown to us.
- Nothing we hold says whether an endpoint streams, so we do not show it either way.
- 2 of 4 listings do not say whether they train on prompts.
Licence and identifiers
What the licence allowsWe hold no licence record for this model. Inside are the identifiers you need to pull it — its Hugging Face repo where we have one, our slug and a machine-readable card.
Licence
Commercial API terms. We hold no licence record for this model, so there is nothing to summarise here.
Identifiers
- Modality record
- text+image+file->text
- Catalogue slug
- x-ai-grok-4-5